Unable to use the app – BlaBlaCar: Carpooling and Bus Review

I previously created an account online which has the option of choosing USA. Now I try to download the iPhone app and it doesn’t have the USA options. When I try UK. It won’t allow me to login since my account phone number is USA. Can someone in the app team help? Maybe you think Americans don’t use phone apps?
Review by ahguit on BlaBlaCar: Carpooling and Bus.